Blue hares Fur - flat black

I am having trouble with the Blue Hares Fur cone 6 oxidation formula below.
I worked excellent as a test glaze, but the larger batches that I have made have both turned out flat black.
I think that my firing schedule has been pretty much consistent.

What size is your test kiln? I have the same problem with test glazes being different than the larger batches, I believe it's because I have a very small test kiln the interior is 8x8 inches and it cools down very quickly. I have started mixing 1000 gram batch and testing it in a larger kiln before I mix up a 5 gallons. I would be curious to know if someone else has a different idea or theory.

I am having trouble with the Blue Hares Fur cone 6 oxidation formula below.I worked excellent as a test glaze, but the larger batches that I have made have both turned out flat black.I think that my firing schedule has been pretty much consistent.

Raymond;It probably has to do with the thickness of application. I think you need to apply your glaze a little thicker to get the effect. Of course you will need to make a test of this. Too thick an application will cause your glaze to run, so, test, test, test.TJR